RFR: 8253597: TreeTableView: must select leaf row on click into indentation region

[Kevin Rushforth]

On Fri, 2 Oct 2020 12:08:52 GMT, Jeanette Winzenburg <fastegal at openjdk.org> wrote:

> .. but doesn't reliably (see report for details). Fixed in TreeTableCellBehavior to check for visibility of the
> disclosureNode.
> Added test that failed before and passes after, along with a couple of sanity tests.
> 
> Also added an alternative mouseEvent creation path into MouseEventFirer (and test) to work-around
> [JDK-8253769](https://bugs.openjdk.java.net/browse/JDK-8253769)

@aghaisas can you review this? A single reviewer should be sufficient, but if you think it needs a second reviewer, go
ahead and indicate that.

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PR: https://git.openjdk.java.net/jfx/pull/313